Placental arteries and veins in wooless mongrel sheep (Ovis aries, L. 1758)

  • Janicleide Maria de Almeida Universidade Federal Rural de Pernambuco, Faculdade de Medicina Veterinária, Recife, PE
  • Rosilda Maria Barreto Santos Universidade Federal Rural de Pernambuco, Faculdade de Medicina Veterinária, Recife, PE
  • Maria Angélica Miglino Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Cirurgia, São Paulo, SP
  • Luciano de Morais-Pinto Universidade de Brasília, Faculdade de Agronomia e Medicina Veterinária, Brasília, DF
Keywords: Placenta, Sheep, Arteries, Veins

Abstract

The blood supply of placenta of 30 wooless sheep without a defined breed was studied by analyzing the pieces obtained through vascular injection of Latex Neoprene 650 stain solution and moulds were made from injection of vinyl acetate. Single gestation (53.33%), gemel (46.66%) and trigeminal (3.33%) cases were observed; in all cases studied it was observed 4 umbilical vessels (2 arteries and 2 veins) besides the allantoidal duct forming the funiculus. Only in one case (trigeminal gestation), the two umbilical arteries of one of the fetuses were fused at he intermediary part of the umbilical funiculus. The hilar area of the placenta varied from 2.0 to 6.0 centimeters depending on the gestational phase. The mean number of cotyledons per gestation was 96 and their sizes and shapes were varied, being the most predominant those greater than 1.5 centimeter and also the ones with ovoid form. The cotyledons were irrigated and drained by a number of diversified arteries and veins, constituting arteriocotyledonary and venocotyledonary arrangements, numbering a total of 299 and 314 casting moulds, respectively.

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Published
2000-01-01
How to Cite
Almeida, J. M. de, Santos, R. M., Miglino, M. A., & Morais-Pinto, L. de. (2000). Placental arteries and veins in wooless mongrel sheep (Ovis aries, L. 1758). Brazilian Journal of Veterinary Research and Animal Science, 37(3), 194-199. https://doi.org/10.1590/S1413-95962000000300004
Section
BASIC SCIENCES